.content{
    /* height: 30px; */
    width: 80%;
    display: flex;
    justify-content: center;
    align-items: center;
}
ul{
    list-style: none;
}
ul>li{
    display: flex;
    width: 100%;
    height: 20px;
}
ul>li:hover>button{
    background-color: red;
    color: white;
    display: block;
}
ul>li>button{
    display: none;
}